CODEWITHSUNDEEP
javascriptregex
Horay
Horay

Reputation: 1408

Allow empty string with regex

I'm trying to check if there's a number in a text input using regular expression. Here's the code:

var regex = /^[0-9]+$/;
if (myInput.val().match(regex)) {
    console.log("number");
} else {
    console.log("bad");
}

It works well, but if I add text, then backspace all the way, I get "bad". How can I make it log "good" when there isn't anything in the text input? I don't want to allow spaces, but I want to allow an empty input.

I tried:

var regex = /\s ^[0-9]+$/;

But then whatever I insert in the input, I always get "bad".

Upvotes: 1

Views: 7371

Answers (2)

yoko
yoko

Reputation: 513

This might fit , either you test for your Exp (^[a-zA-Z0-9]+$) or for an empty string (^$).

var regex = /(^$)|(^[a-zA-Z0-9]+$)/;
if (myInput.val().match(regex)) {
    console.log("number");
} else {
    console.log("bad");
}

Upvotes: 5

gurvinder372
gurvinder372

Reputation: 68393

try this (* in place of +)

var regex = /^[0-9]*$/;
if (myInput.val().test(regex)) {
    console.log("number");
} else {
    console.log("bad");
}

Upvotes: 1

Related Questions